Subsea Cable Installation Calculator

Description

Cable installation is one of the essential operations during the windfarm installation. Cables are usually installed using cable lay vessels (CLVs). During installation the cable is stored in carousels (a huge cylindrical basket which can rotate on the vessel to payout cable) or baskets, bent over a set of rollers, a single roller or a curved surface. Further, the vessel also needs to make sure the cable laid over seabed must not deform under forces and be laid in a stable manner. Following are the calculation sheets to be accessed.

• Carousel Calculation – Calculates weight of the cable and layable length.
• Roller Load Calculation – Calculates load on the roller/cable in contact
• Point Load Calculation – Calculates load on a single roller/cable in contact (different from spread load)
• SWP Calculation – Calculates ‘sidewall pressure’ on the cable, an important cable criteria to be checked.
• Cable Curve Stability Calculation – Gives the minimum lay radius required for the cable to be stable

References

• Cable Stability – DNV-RP-F109 Section 4.3
• Sidewall Pressure – DNV-RP-J301
• Point Load – basic physics formula
• Roller Load – Cigre 623 RECOMMENDATIONS FOR MECHANICAL TESTING OF SUBMARINE CABLES
• Caroussel load – basic physics formulae